package com.imm.filter;

import com.alibaba.fastjson.JSON;
import com.imm.common.Result;
import com.imm.utils.BaseContext;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {

    // 路径匹配器
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse)servletResponse;
        // 本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("本次请求路径：{}", requestURI);
        // 不需要拦截的目录
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        // 检查路径是否通行
        boolean check = check(urls, requestURI);
        if (check) {
            log.info("本次请求不需要处理：{}", requestURI);
            // 放行
            filterChain.doFilter(request, response);
            return;
        }
        // 判断employee是否完成登录
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已登录，用户ID为：{}", request.getSession().getAttribute("employee"));
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            // 放行
            filterChain.doFilter(request, response);
            return;
        }
        // 判断user是否完成登录
        if (request.getSession().getAttribute("user") != null && request.getSession().getAttribute("employee") == null) {
            log.info("用户已登录，用户ID为：{}", request.getSession().getAttribute("user"));
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            // 放行
            filterChain.doFilter(request, response);
            return;
        }

        log.warn("用户未登录");
        // 未登录的处理
        response.getWriter().write(JSON.toJSONString(Result.error("NOTLOGIN")));
    }

    public  boolean check(String[] urls, String requestURI) {
        for (String url : urls){
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }
        }
        return false;
    }

}
